ᐅ Air-to-water heat pump + underfloor heating + controlled ventilation with heat recovery – individually adjustable room temperatures?
Created on: 19 Apr 2022 15:09
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HoisleBauer22
In my new KfW55 building, a air-to-water heat pump combined with underfloor heating is planned from the basement (required due to KfW55, crazy!) up to the top floor. Additionally, there will be a mechanical ventilation system with heat recovery, also covering from the basement up to the upper floors. Unfortunately, the mechanical ventilation system cannot be adjusted or turned off room by room.
Now my question to the experts here is: With this setup, is there any chance to keep a room (e.g., a bedroom or a basement room) significantly cooler (about 5°C (9°F) cooler, for example 16°C (61°F)) than all the other rooms (e.g., 21°C (70°F))? Or would you need an air conditioning system that then works against the mechanical ventilation? (Completely crazy idea...!)
Now my question to the experts here is: With this setup, is there any chance to keep a room (e.g., a bedroom or a basement room) significantly cooler (about 5°C (9°F) cooler, for example 16°C (61°F)) than all the other rooms (e.g., 21°C (70°F))? Or would you need an air conditioning system that then works against the mechanical ventilation? (Completely crazy idea...!)
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Deliverer19 Apr 2022 22:30HoisleBauer22 schrieb:
Do you think it could get that bad?No. Probably not. Only IF there is mold somewhere, then only there.HoisleBauer22 schrieb:
Apparently, the scientifically determined ideal temperature for falling asleep is between 16 and 19 degrees.That is probably rarely achievable for half of the population without air conditioning. ;-) So: I’ve heard that too, but I don’t know anyone who actually keeps 16°C (61°F) in their bedrooms. We keep it at 21°C (70°F) all year round, and it feels much more comfortable to us than the old summer-winter swings between 18°C and 28°C (64°F and 82°F), which we thankfully got rid of thanks to heat pumps and air conditioning.
I would say you get used to not feeling cold when you wake up very quickly and then appreciate the new build. Times are simply changing — for the better when it comes to living comfort.
HoisleBauer22 schrieb:
The scientifically determined ideal temperature for falling asleep is reportedly between 16 and 19 degrees Celsius (61 and 66°F). So, I would prefer the temperature to be within this range. The problem, of course, is that the body loses a lot of moisture, which shouldn’t stay in the room for long. That’s why I think the mechanical ventilation with heat recovery shouldn’t be turned off. I would simply turn off the thermostat in the bedroom but keep the mechanical ventilation running. The ventilation system only recovers heat (usually around 90-95%) and doesn’t actually heat the air itself. With a full air exchange, you still lose about 5% of the heat through the ventilation, which has quite a flow rate.
We have such a setup in operation here—even with (crazy!) air conditioning working against it.
From our recent experience over Easter, when we were out of the house, I can say that rooms where the thermostat was turned down definitely became a few degrees cooler than the others.
We usually keep the heating turned off in our office. We run hardware all day long here (4 monitors and various computers) that produces so much waste heat that in a well-insulated new building, you don’t need to heat the room.
However, if you’re away for several days, the office cools down quite a bit, despite the mechanical ventilation running. 🙂
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HoisleBauer2224 May 2022 23:46For those who want to read more on this topic, I just found another thread: https://www.hausbau-forum.de/threads/schlafzimmer-zu-warm-trotz-ausgeschalteter-heizung.37731/
HoisleBauer22 schrieb:
I need to ask my home builder about that. There’s no need to ask: just adjust the vents.
However, a mechanical ventilation system with heat recovery is not designed to balance room temperature, that should be added.
The controlled ventilation systems commonly offered simply cannot achieve this because the airflow rate is far too low and air is a poor conductor of heat. Such a controlled ventilation system can only provide continuous fresh air intake and moisture removal (using an enthalpy exchanger and an adjustable bypass to maintain a set value).
Even the often-claimed pseudo “cooling” effect of controlled ventilation systems is misleading, as nothing more happens than the system exhausting the room air directly outside (without passing it through the heat exchanger first). The supposedly “cooler” outside air cannot provide effective cooling at such a low air exchange rate.
Even the often-claimed pseudo “cooling” effect of controlled ventilation systems is misleading, as nothing more happens than the system exhausting the room air directly outside (without passing it through the heat exchanger first). The supposedly “cooler” outside air cannot provide effective cooling at such a low air exchange rate.
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